Selection of efficient absorbent for CO2 capture from gases containing low CO2.

Amine-based absorption processes are widely used in natural gas processing, but recently they have been considered for CO₂ capture from flue gas emitted from thermal power plants. The main issue of amine used in the CO₂ capture process is the high cost of solvent regeneration. So, this issue can be solved by using efficient amine absorbent. The amine type absorbents employed in the experimentation were an aqueous blend of 2-(Diethylamino)ethanol (DEEA) with different types of diamine activators such as piperazine (PZ), 2-(2-aminoethylamino)ethanol (AEEA), hexamethylenediamine (HMDA), ethylenediamine (EDA), and 3-(Dimethylamino)-1-propylamine (DMAPA). An absorption experiment was performed to evaluate the CO₂ absorption performance in terms of CO₂ loading, absorption capacity, and absorption rate. The experiment was performed to assess the CO₂ desorption performance in terms of desorption capacity, desorption rate, cyclic capacity, and regeneration efficiency. From the results of absorption-desorption and comparison with benchmark amine absorbent MEA, the aqueous blend of DEEA and HMDA indicated the best performance for CO₂ capture applications among all the tested amine blends. [ABSTRACT FROM AUTHOR]